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<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=yes">
    <title>Three.js - Scenegraph - Car</title>
    <style>
    html, body {
        height: 100%;
        margin: 0;
    }
    #c {
        width: 100%;
        height: 100%;
        display: block;
    }
    </style>
  </head>
  <body>
    <canvas id="c"></canvas>
  </body>
<script src="resources/threejs-lessons-helper.js"></script> <!-- you can and should delete this script. it is only used on the site to help with errors -->
<!-- Import maps polyfill -->
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<script async src="https://unpkg.com/es-module-shims@1.3.6/dist/es-module-shims.js"></script>

<script type="importmap">
{
  "imports": {
    "three": "../../build/three.module.js"
  }
}
</script>

<script type="module">
import * as THREE from 'three';

function main() {
  const canvas = document.querySelector('#c');
  const renderer = new THREE.WebGLRenderer({canvas});
  renderer.setClearColor(0xAAAAAA);

  const fov = 40;
  const aspect = 2;  // the canvas default
  const near = 0.1;
  const far = 1000;
  const camera = new THREE.PerspectiveCamera(fov, aspect, near, far);
  camera.position.set(8, 4, 10);
  camera.lookAt(0, 0, 0);

  const scene = new THREE.Scene();

  {
    const light = new THREE.DirectionalLight(0xffffff, 1);
    light.position.set(-1, 2, 4);
    scene.add(light);
  }
  {
    const light = new THREE.DirectionalLight(0xffffff, 1);
    light.position.set(1, -2, -4);
    scene.add(light);
  }

  const carWidth = 4;
  const carHeight = 1;
  const carLength = 8;

  const bodyGeometry = new THREE.BoxGeometry(carWidth, carHeight, carLength);
  const bodyMaterial = new THREE.MeshPhongMaterial({color: 0x6688AA});
  const bodyMesh = new THREE.Mesh(bodyGeometry, bodyMaterial);
  scene.add(bodyMesh);

  const wheelRadius = 1;
  const wheelThickness = .5;
  const wheelSegments = 6;
  const wheelGeometry = new THREE.CylinderGeometry(
      wheelRadius,     // top radius
      wheelRadius,     // bottom radius
      wheelThickness,  // height of cylinder
      wheelSegments);
  const wheelMaterial = new THREE.MeshPhongMaterial({color: 0x888888});
  const wheelPositions = [
    [-carWidth / 2 + wheelThickness / 2, -carHeight / 2,  carLength / 3],
    [ carWidth / 2 + wheelThickness / 2, -carHeight / 2,  carLength / 3],
    [-carWidth / 2 + wheelThickness / 2, -carHeight / 2, -carLength / 3],
    [ carWidth / 2 + wheelThickness / 2, -carHeight / 2, -carLength / 3],
  ];
  const wheelMeshes = wheelPositions.map((position) => {
    const mesh = new THREE.Mesh(wheelGeometry, wheelMaterial);
    mesh.position.set(...position);
    mesh.rotation.z = Math.PI * .5;
    scene.add(mesh);
    return mesh;
  });

  function resizeRendererToDisplaySize(renderer) {
    const canvas = renderer.domElement;
    const width = canvas.clientWidth;
    const height = canvas.clientHeight;
    const needResize = canvas.width !== width || canvas.height !== height;
    if (needResize) {
      renderer.setSize(width, height, false);
    }
    return needResize;
  }

  // const carPosition = [0, 0, 0];

  function render(time) {
    time *= 0.001;

    if (resizeRendererToDisplaySize(renderer)) {
      const canvas = renderer.domElement;
      camera.aspect = canvas.clientWidth / canvas.clientHeight;
      camera.updateProjectionMatrix();
    }

    wheelMeshes.forEach((obj) => {
      obj.rotation.x = time;
    });

    renderer.render(scene, camera);

    requestAnimationFrame(render);
  }

  requestAnimationFrame(render);
}

main();
</script>
</html>


